In http://samba.kn.vutbr.cz/samba/docs/Samba-HOWTO-Collection.pdf
in section Domain Control, Domain Control Example Configuration, page 55
is smb.conf example with this:
logon path = \{}\{}%N\{}profiles\{}%u
It seems the \{} construct prevents the next character to be expanded to a special char by the \. There seems to be nothing about this in man smb.conf. I suggest adding
this information in man smb.conf.